Electric fire-alarm.



No. 755,783. PATENTED MAR. 29, 1904. l

A A. LUEGKERT.

ELEGTRIC PIRE ALARM.

Arrmcnron FILED DB0. 1o. 1902.

.l IonnL.

Y marked thereon, which form a Patented March 29, 1904.

PATENT OEEICE.

AUGUST LUEOKERT, OF ST. LOUIS, MISSOURI.

ELECTRIC FIRE-ALARM.

SPECIFICATION forming partofLetters Patent No. 755,783, dated March 29, 1904.

Appiieation tied December 1o, 1902.

full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to` make and use the same, reference being had to the accompanying drawings, and to the letters of reference part of this speciiication.

My invention relates to improvements in electric tire-alarms to be used in public and private houses and in all institutions where there are a number of separate 'and private apartments; and the object of my invention is to provide a fire-alarm system that locates a re in any particular room and announcesy it in the office or any room or place designated, as that occupied by the proprietor, a system arranged with an electrical annunciator and a battery and an electrical bell in the proprietors room or place and connected by wire to a fusible switch in each room represented on the annunciator. These objects I attain by the mechanism illustrated in the accompanying drawings, in which- Figure l is a perspective view of the annunciator with its battery in a case and electric bell attached to the case outside. Fig. 2 is a front elevation view of a section of the annunciator representing the mechanism and numbers for four rooms. Fig. 3 is a side elevation sectional view of one room-section of the annunciator. Fig. 4 is an edge vertical view of a portion of the annunciator-case and the electric `bell attached to it. perspective viewyof a portion of the woodwork of a room with the fusible switch and its connecting-wire attached to it. Fig. 6 is an upper section View of an ordinary dry battery. ,Fig 7 represents a perspective view of a switch on the main line from the battery attached to a portion of the case A.

In all of the views like letters refer to like parts. Referring to the drawings, A represents a Fig. 5 is a `,rial No. 134,713. (No model.)

case in which the parts of the annunciator are arranged.

B represents an ordinary dry battery. (Shown in Figs. 1 and 6.)

O is an ordinary electric bell, with its positive and negative binding-posts c c2.

D is a square strip of wood which may be room-sections. In this case it is shown to be long enough for four sections, to the sides of which are attached the various parts, as follows: To the front side is hinged a door E,

- which is provided at or near its center with a stud-bolt e', having a nut that may be adj usted out or in from the door to make it drop quicker, ifdesired. vThe rod e2 and doors E E are secured to the strip D by staples c3 e3. 'Io the top side of the strip D is pivoted a lever F and a rod f', the rod f being held to the strip D by staples fo f5, the back end of which, f2, turns down at an angle, and the front end of it is provided with a weight enlargement f3 and a hook portion f4, that turns down over the top of the door to hold it shut until tripped off by the stroke of the'hammer g3 on the other end of the lever F, and behind each door a number is inserted in the strip D, which represents the number of a room. To

" the back side or the under side of the strip D an electric-bell mechanism G is attached by means of a twisted plate g4 and screws to the said strip, said bell-movement having its negative binding-post g' and positive binding-post g2 and its bell-hammer g3, which strikes on the end f2 of the lever F and causes the other end, with its hook f4, to rise and release the door E, which door then drops down and exposes the numbers behind the door. In this application of this bellfmovement the bell is removed and the arm to the hammer g3 is bent down in a proper position to strike the lever F on the room-section. In front ofthe roomsection and a little below thedoors'E E in Fig. 2 a switch-rod H extends along the line of sections G G and terminates in a binding-post on the outside of the case A near to the electric bell O, to which it is connected by wire, and around this switch-rod H a conducting-wire from each room forms a loop Z' in front of its long enough for any desired number of the respective door, which is caused to make a connection to the bell when the door E falls on it and presses it against the rod H.

I is a broken section of the woodwork in one of the rooms, to which is attached the parts of a simple open switch, which consists of an over branch e", with its binding-plate 3, and an under brauch 2, with its binding-plate c, and over these branches c" and v7 a hanger z' is secured, and in this hanger 27" is hung a plunger-shaft i, provided with an enlarged hammer-head and a coiled spring, which said spring forces the hammers head down onto the over branch z" and springs it.down onto the under branch 2 and makes a connection, remaining so until the plunger-shaft is raised, and when the plunger-shaft is raised and a fusible drop of metal 7 is soldered to it the open switch is formed and remains so until it is fused by a stated heat in the room of from 160O to 1800, caused by a fire breaking out therein. The strength of the spring will close the switch when the fusible drop of metal becomes the least bit softened by the heat, which may vary from 1600 to 1800.

Fig. 7 represents a portion of case A, to which an ordinary turn out-switch K is attached to stop the ringing of the bell, if desired, after the alarm has been given and until the open room-switch is again secured by the fusible drop of metal.

The feed-wire J is connected with the positive binding-post of the battery B and passes through the switch K and connects to the positive binding-posts g2 g2 on each of the roomsections of the annunciator and then continues on and connects to the bell C on its positive binding-post c2. Also an intermediate branch feed-wire connects with the binding-post g2 and extends to the upper positive arm of the magnet G.

It is necessary at this point to more fully explain the construction and working of the loop l and the switch-rod Hin connection with the action of the door E. The loop Z' has no insulation, but is simply a naked and uncovered wire, which, as it stands intact, does not touch the switch-rod H or anything else. The switch-rod H is not insulated, but it is connected by wire at 71, to the bell at c. The action of the hammer g3 striking the end of the lever F raises the other end and releases the door, and it falls by gravitation on the wire of the loop Z and presses it firmly against the switch-rod H and makes the circuit complete from the room through the annunciator to the bell; but first when the open room-switch is closed the circuit through the line L and into the electromagnet of G is shorter until after the hammer g vibrates and strikes the lever F and releases the door E, which drops and presses the loop Z' onto the switch-rod H. Then the current takes the longer circuit to the bell.

A wire L passes from each rooms open switch to each rooms section G of the annunciator, being attached to its negative bindingpost g and passes forward and formsaswitchloop Z around the switch-rod H, and when the door E drops on it it makes a connection through the said switch-rod H to the negative binding-post c on the bell and causes it to ring when the metal drop 7 is fused. Thus each room-switch has its connection with its section of the annunciator and through its switch-loop l and its open door E connects ywith the bell C by its negative binding-post and rings it,the current in the wire first causing the hammer g3 to strike the lever F and raising the other end drops the door E. Also an intermediate branch wire connects with the negative binding-post g and extends to the lower negative arm of the magnet G and completes the short circuit through the magnet G, which causes the hammers g3 to strike the lever F and causes the dropping of the door and the closing of the switch at H and rings the bell C, which is on the long or extended circuit.

M N O P represent the return-wires to the battery B from each of the four rooms shown in the annunciator, each connecting-wire being connected into the main return-wire, and

in the samemanner any number of rooms may be provided with switches set by a fusible drop and may have a section in the annunciator with its hammer 'and lever to ,drop the door and expose its number in the front when the door is down and ring the bell when the metal drop is fused and the open switch is closed by a fire, causing a certain degree of heat in the said room from 160O to 1800, the group of views Figs. 3, 4, 5, 6, and 7 being connected by the wires, so as to show the complete arrangement and action for a single room, and the views Figs. l and 2 show how any number of room-sections desired may be represented in the annunciator and be made to operate the same as asingle one by operating the magnet G through its short circuit and then the bell through its extended circuit, as shown and described.

Having described the various parts of my invention and their Working relation to each other, so that any one skilled in the arts could make and operate the same, what I claim as new, and desire to secure by Letters Patent,

l. An electric alarm system,comprising circuits and a source of electric energy therefor, a series of annunciator-sections representinga series of rooms, an electric magnet G, afoundation-strip D on which said electromagnet is mounted, an armature for said electromagnet, a hammer g3 on said armature, a leverF pivoted on one of said annunciator-sections, and adapted to be tilted by the hammer g3, a door E, pivoted to said section and held in normal position by the lever F, aswitch-rod H, a switch-loop Z' adjacent thereto, said switchrod H and switch-loop Z being in the path of IOO IOS

ITO

Asaid door E, an electric bell, and circuit connections so arranged that when the electric magnet G is energized the door E is caused to be released to fall on the switch thus closing a circuit through said bell, substantially as shown and described.

2. An automatic electric alarm system,com prising circuits and asource of electric energy therefor, a series of annunciatorsections representingaseries of rooms by number, an electromagnet G, a foundation-strip D onvwhich said electromagnet is mounted, an armature for said electromagnet, a hammer g3 onv said armature, a lever F pivoted on said foundation-strip and adapted to be tilted by said hammer, adoor E hinged toa section and held in normal position by the leVervF, a'. switchrod H, a switch-loop Z adjacent thereto, said switch-rod H and switch-loop Z being in the path of said door E, an electric bell, a thermostat for each annunciator-section, and circuit connections such that when a thermostat is operated its corresponding electromagnet AUGUST LUECKERT. Witnesses C. L. WEBER, F. M. FosEGATE. 

